pystrometry's Introduction

pystrometry - Support for high-precision astrometry timeseries analysis

This code collection evolved over the last 10+ years and does therefore not always conform with coding standards and best practices, but it is installable via PyPI: pip install pystrometry.

pystrometry provides a variety of functionalities and has been used in several publications. It is under active development.

Example usages

Plotting the orbital motion with default parameters
```
  from pystrometry.pystrometry import OrbitSystem 
          
  orb = OrbitSystem()  # default parameters
  orb.plot_orbits()    
```
More customised orbit plotting example from this notebook: 2_exoplanet_example_orbit.ipynb

Define the system parameters

  from collections import OrderedDict
  attribute_dict = OrderedDict([  ('RA_deg', 164.), 
                                  ('DE_deg', -21.),
                                  ('absolute_plx_mas', 27.), 
                                  ('Tp_day', 57678.4), 
                                  ('omega_deg', -23.),
                                  ('P_day', 687.), 
                                  ('ecc', 0.08), 
                                  ('OMEGA_deg', 114.),
                                  ('i_deg', 31.), 
                                  ('m1_MS', 0.9),
                                  ('m2_MJ', 3.)])
                                  
  orb = OrbitSystem(attribute_dict)
  orb.plot_orbits()

Compute the proper motion displacements in RA, Dec for the system:

  t_mjd = np.linspace(50000, 52000)
  delta_ra_star_mas, delta_dec_mas = orb.ppm(t_mjd)

Compute and plot the astrometric amplitudes of known exoplanets.
The code is in this notebook: 1_exoplanet_signatures.ipynb

Example conda environment creation that allows for running the example notebooks

This requires a conda installation.

Create a dedicated environment (here named astrom) with the necessary dependencies:

conda create --name astrom --yes python=3.7 pandas=1.2.5 pip jupyterlab pyyaml uncertainties

Activate that environment:

conda activate astrom

Install pystrometry from PyPI:

pip install pystrometry

Open jupyter notebook, e.g.

jupyter notebook [path-to-downloaded-file]2_exoplanet_example_orbit.ipynb

Contributing

Please open a new issue or new pull request for bugs, feedback, or new features you would like to see. If there is an issue you would like to work on, please leave a comment and we will be happy to assist. New contributions and contributors are very welcome!

References

Citation

If you find this package useful, please consider citing the Zenodo record using the DOI badge above. Please find additional citation instructions in CITATION.

pystrometry's People

Contributors

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pystrometry's Issues

refactor OrbitSystem class

move from long list of init arguments to passing a dictionary
include option to initalize system with photocenter semimajor axis instead of individual masses
add support for multi-companion systems
Make compliant with jwql-like coding standards (https://github.com/spacetelescope/jwql)

replace slalib functions by their astropy equivalents

to remove the slalib dependency entirely.

Notice: You might be using enable_deprecations_as_exceptions that is removed in astropy v6

This is an automated issue from Astropy. You might be using code removed in astropy v6.0.dev from astropy/astropy#14670 in the following files:

* pystrometry/tests/test_example.py

Please use https://docs.pytest.org/en/stable/how-to/capture-warnings.html instead.

If this issue is opened in error or irrelevant, feel free to close. We apologize for any inconvenience caused.

johannes-sahlmann / pystrometry Goto Github PK